Ribbed ballast housing



FIG. 1 is a front view for a ribbed ballast housing showing my design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a back view thereof;

FIG. 7 is a top perspective view thereof; and,

FIG. 8 is a bottom perspective view.

The broken line showing of the luminaire is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for ribbed ballast housing, as shown and described. 